get-ssl-verify-result
returns two values. The first value is a numeric code indicating the
status of verification. 0 indicates successful verification. The
second value is a string with a text representation of the status.

Note, if SSL handshake has not yet been performed, or if the peer did
not provide a certificate, this function returns an OK status.

The possible return values are shown in the following information
copied from the OpenSSL documentation. The numeric value (0, 2, 3, 4,
etc.) is the first returned value and the string is the second. The
string does not include the capitalized and underscored
descriptor. Additional information not included in the returned string
is included in this list. Thus, when the peer certificate verification
is sucessful, 0 and "ok" are returned. X509_V_OK and
'the operation was successful.' are not part of the string.

0 X509_V_OK: "ok" the operation was successful.

2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer
certificate" the issuer certificate could not be found:
this occurs if the issuer certificate of an untrusted
certificate cannot be found.

3 X509_V_ERR_UNABLE_TO_GET_CRL "unable to get certificate CRL"
the CRL of a certificate could not be found. Unused.

4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: "unable to decrypt certificate's signature" the certificate signature could not be decrypted. This means that
the actual signature value could not be determined rather than it
not matching the expected value, this is only meaningful for RSA
keys.

5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: "unable to decrypt CRL's
signature"
the CRL signature could not be decrypted: this means that the
actual signature value could not be determined rather than it not
matching the expected value. Unused.

6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: "unable to decode
issuer public key"
the public key in the certificate SubjectPublicKeyInfo
could not be read.

7 X509_V_ERR_CERT_SIGNATURE_FAILURE: "certificate signature failure"
the signature of the certificate is invalid.

8 X509_V_ERR_CRL_SIGNATURE_FAILURE: "CRL signature failure"
the signature of the certificate is invalid. Unused.

9 X509_V_ERR_CERT_NOT_YET_VALID: "certificate is not yet valid"
the certificate is not yet valid: the notBefore date is after the
current time.

10 X509_V_ERR_CERT_HAS_EXPIRED: "certificate has expired"
the certificate has expired: that is the notAfter date is before
the current time.

11 X509_V_ERR_CRL_NOT_YET_VALID: "CRL is not yet valid"
the CRL is not yet valid. Unused.

12 X509_V_ERR_CRL_HAS_EXPIRED: "CRL has expired"
the CRL has expired. Unused.

17 X509_V_ERR_OUT_OF_MEM: "out of memory"
an error occurred trying to allocate memory. This should never happen.

18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: "self signed certificate"
the passed certificate is self signed and the same certificate cannot
be found in the list of trusted certificates.

19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: "self signed certificate in
certificate chain"
the certificate chain could be built up using the untrusted cer-
tificates but the root could not be found locally.

20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: "unable to get local
issuer certificate"
the issuer certificate of a locally looked up certificate
could not
be found. This normally means the list of trusted certificates is
not complete.

21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: "unable to verify the
first certificate"
no signatures could be verified because the chain contains only one
certificate and it is not self signed.

29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH: "subject issuer mismatch"
the current candidate issuer certificate was rejected because its
subject name did not match the issuer name of the current certifi-
cate. Only displayed when the -issuer_checks option is set.

30 X509_V_ERR_AKID_SKID_MISMATCH: "authority and subject key identifier
mismatch"
the current candidate issuer certificate was rejected because its
subject key identifier was present and did not match the authority
key identifier current certificate. Only displayed when the
-issuer_checks option is set.

31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: "authority and issuer serial
number mismatch"
the current candidate issuer certificate was rejected because its
issuer name and serial number was present and did not match the
authority key identifier of the current certificate. Only displayed
when the -issuer_checks option is set.

32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN: key usage does not include
certificate signing" the current candidate issuer certificate was
rejected because its keyUsage extension does not permit certificate
signing.